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Door position indicator
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Patent number 4,922,064
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Issue date May 1, 1990
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Adtec Incorporated
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Dean C. Price
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E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES
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Door locking system
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Patent number 4,691,542
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Issue date Sep 8, 1987
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Southern Steel Company
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Quentin H. Young
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E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES
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Door locking system
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Patent number 4,640,108
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Issue date Feb 3, 1987
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Southern Steel Company
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Quentin H. Young
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E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES
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Door locking system
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Patent number 4,509,347
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Issue date Apr 9, 1985
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Southern Steel Company
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Quentin H. Young
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E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES
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Cell locking system
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Patent number 4,180,287
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Issue date Dec 25, 1979
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Southern Steel Company
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David H. Youngblood
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E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES